*{
    margin: 0;
    padding: 0;
}
body{
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    font-family: sans-serif;
    background: #000;
}
h2{
    font-size: 6em;
    color: #333;
    font-weight: 500;
    padding: 0px 20px;
}
h2 span{
    animation: animate 1.2s linear infinite;
}
h2 span:nth-child(1){
    animation-delay: 0s;
}
h2 span:nth-child(2){
    animation-delay: 0.2s;
}
h2 span:nth-child(3){
    animation-delay: 0.4s;
}
h2 span:nth-child(4){
    animation-delay: 0.6s;
}
@keyframes animate{
    0%,80%{
        color: #333;
        text-shadow: none;
    }
    100%{
        color: #fff;
        text-shadow: 0 0 10px #fff,
                     0 0 20px #fff,
                     0 0 40px #fff,
                     0 0 80px #fff,
                     0 0 120px #fff;
    }
}
